Syringe



H. H. SCHULZ Oct. 25, 1938.

SYRINGE 3 Sheets-Sheet l Pg. 2. 47a

Filed Feb; 6, 1955 Fig. 1.

Mffirak 3r W Fr 77% H. H. SCHULZ Oct. 25, 1938.

SYRINGE Filed Feb. 6, 1956 s Sheets-Sheet 2 Fig. 6-;

Fig.3.

Arman/5 H. H. SCHULZ Oct. 25, 1938.

' SYRINGE Fiied Feb. s, 1936 {Sheds-sheaf s .25 sterilizable. materials.

3&1

Patented Oct. 25, 1938 UNITED STATES 2,134,291 V SYRINGE Hans Herbert Schulz, London, England Application February 6, 1936, Serial No. 62,575

In Great Britain April 27, 1935 I 15 Claims.

This invention relates to syringes especially suitable for use for surgical and medical purposes of the kind in which the filling tube also acts as the discharge tube, and is an improve- 5 ment on the invention forming the subject matter of my copending application Serial No. 54,811, filed December 17, 1935, for Letters Patent according to which during the filling operation liquid is forced into an expansible and contractible storage chamber in the form of a rubber sleeve normally lying in close proximity with the outer wall of the apparatus, whence it'is discharged at a regulatable rate through a valve.

Amongst the desiderata for apparatus of this class are the following. They should be light and portable, simple in action and easy to manipulate with a single hand, the discharge should take place at a constant rate, and without the need of manual force, and the assemblage, dis- '20 assemblage and cleaning operations should be simple. Further they should be simple and cheap to construct, the separate parts should be few, and the apparatus should so far as possible be capable of manufacture from hygienic and easily The avoidance of any tendency to leakage is also of considerable importance.

The present invention is intended to fulfil these requirements and according to it the con- 30 tractible storage chamber is made in the form of a bag or sac which completely enclosesone end of the apparatus and normally lies in close proximity with the cylindrical walls or a portion thereof, and the end of the bag is secured to the cylinder wall in a fluid tight manner. The valve is situated at the end of the apparatus preferably remote from the nozzle and enclosed by the said bag or sac, and is operable by pressure through the same, and the Valve may be retained in its seat by the elastic reaction thereof. In the preferred form the valve is made integral with the bag or sac.

According to another feature of the invention the apparatus may be filled by resting the nozzle on the bottom of a basin or the like and then pulsating. Other features will become apparent from the description hereunder.

Examples of the invention will now be more particularly described by reference to the accompanying drawings.

Fig. 1 is a longitudinal'section of one form.

Fig. 2 is a similar View of another form. Fig. 3 ma sectional d etgtil' of a,n'igdiiicatiggn se iignals atili iila dia eiica Fig. 5 is a part. sectional View ofa further modification.

Fig. 6 is a part sectional view of a still further modification, and

Fig. 7 is a sectional view showing an attachment for filling from a tap.

In Fig. 1 an india rubber bag I is adapted to be slidden or drawn over to hood an open ended pump barrel 2 having an internal screw-thread 2a at that end adjacent to the end wall 3 of the bag I. Apertures 4 in the wall of the barrel communicate with apertures 5 in the tapering wall of a plug seating ring 1, the conical centre of which makes a fluid tight joint with the wall of a tapering'central aperture in .an internal flange 9 of the barrel 2. ring I fits snugly in a flanged external screw threaded ring Ill on to which the corresponding end of the barre-l 2 is screwed.

The edges of the flange Illa. of the ring I0 may The cylindrical flange 10. of the,

be knurled to interlock with the elastic wall of the bag I. The external portion la of the bag I may be knurled for facilitating hand gripping in assemblage and disassemblage. I The bag I may be secured to the ring H1 in any convenient way, as by moulding the rubber through anchoring slots lb of the flanged portion 10a thereof. An inner flange lb formed on the bag I may be sprung over the flanged portion Illa. of the ring I 0 so asto lie between it and the endof the barrel 2 whereby the tion. w 7

The seating ring I which has a push fit with the ring In, is'fast with a hollow stem II which extends axially along the barrel 2. The outer end of this stem ll forms a seating 12 for a valve l3.whose spindle 14 passes through the stem II and is secured by moulding by an anchoring plate l5 to the end wall 3 of the bag. The thickened portion 3a of the end wall is pressed by the finger or thumb to valve l3 axially off its seating.

Thus the interior of the barrel 2 is divided into charging and discharging chambers 16 and ll of which the latter communicates through bag I, is securely retained in posimove the 5 apertures 4 and 5 with the space formed between the outside 'of the barrel :2 and the inside of the bag I when the-latter; is expanded and the former receives a'piston 19. v I

The end of the outer wall of the barrel 2 remote from thebag end 3 has a threaded collar 2b and, spaced therefrom is another 'collar 20 so as to form an annular channel inwhich a emer nce-m trans allliln 5vl1h Q -ZE QcHQEQ QE3Q-Ji lz il medially apertured, conical nut 29 which, when screwed home, compresses the beaded edge Ic of the bag I against a radial abutment wall of the other collar 20 and produces an efiective fluid tight closure of the bag I around the barrel 2 and at the only joint which the bag I requires.

The collar 20 may be chamfered back away from its abutment wall and the bag I similarly shaped by expanding it near-its open end.

The piston 19 has a suction flap valve 2I and an outer tubular extension 22. The hollow stem II passes through the piston I 9 and intrudes into the tube 24 when this is the nozzle tube, or into one part of the telescopic tubes 23 and 24. The tube 23 may be a catheter part which can be drawn out of the other part and retained in an inclined position with respect thereto and to the axis of the instrument by an inclined screwthreaded connection 24b, 24a. An overhang may be provided between the two tubes to prevent disconnection.

A non-return valve 25, controls inlet ports 26 into the elastic storage chamber formed between I and 2, so that on relative movement occurring between the barrel 2 and the piston I9, so that on pulsating or reciprocating the cylinder whilst the nozzle 23a is pressed against the bottom of a vessel of liquid, a charge of liquid is pumped into the elastic storage chamber.

The piston I9 is returned by an elastic sleeve 21 anchored at one end to the piston head, and at the other end by a beaded edge 21a engaging over a shoulder 33 of the barrel, and clamped by an internal radial wall 20a of the conical nut 20 against the corresponding end of the barrel.

To assemble the appliance the sac l is secured to the ring III. The plug I, Ia is then fitted in position as shown with the stem II surrounding the spindle I4 and the valve I3 is screwed onto the spindle.

The barrel 2 is screwed on to the ring I and the bag when in its normal position has its free edge sprung over the abutment collar 20, the piston I9 is then inserted into the barrel 2 and the free edge of its elastic sleeve is folded over the corresponding end of the barrel 2, whereafter, the telescopic members having been assembled together, the apertured conical nut 20, is passed thereover and screwed onto the barrel.

In Fig. 2, the pump barrel 30 is provided with a screw threaded flange 32. A flanged valve body 33 is provided with a shouldered down screw threaded portion 33a to screw into such screw threaded flange 32.

The part 33a. is provided with a seating with which a discharging valve 34 co-operates. The barrel 30 is thus divided so as to form an end chamber which is in communication through apertures 35 and 36 with the storage space between the external wall of the barrel 30 and the sac or bag 31, the remaining part 38 of the cylinder receiving the piston 39.

The end wall of the sac 31 has a thickened integral central button-like part 40, a stem 4I extending axially inwards fromsuch button like part 40, having the conical discharging valve 34. The end wall of the sac or bag (I or 31) is so arranged that the button lies flush with or below the plane of the corresponding end of the sac or bag so as to lessen'the risk of the discharge valve being opened inadvertently while the device is being handled. 7 v In Fig. 2 the. piston is in the form of an openended cylinder 39 which surrounds the cylindrical wall of an elastic sleeve 42 having a thickened inner part 43 medially perforated with which the correspondingly formed inner end of the catheter 44 can make a fluid tight joint when the tubes 44 and 45 are telescoped and the device is housed in a suitable two-part container 46 adapted'to be screwed together to hold the catheter 44 against the part 43.

Secure connection of the piston 39 with the rubber sleeve may be efiected by moulding the thickened end thereof to a radial internal flange 39a of the piston wall by anchoring slots 3%.

The suction valve 41 is an expanding rubber plug in the nozzle 48 and having a central way 41a and circumferential ways formed by spaces 411) between the tapered wall of the plug and the tapered end of the nozzle leading to openings 49 in the nozzle 48 communicating with a central bore 50c; When pressure is exerted against the head of the plug by pressing this against the bottom of a vessel the way 41a is sealed and the spaces 47b sealed up by distortion of the plug. The non-return valve is indicated by 48a.

On relative movement occurring between the cylinder and the piston realized by pulsating or reciprocating the cylinder whilst the nozzle or catheter is pressed against the bottom of a vessel of liquid, the suction valve 41 closes during the stroke which pumps liquid into the elastic storage chamber and opens when the pressure of the nozzle against the bottom of the vessel of liquid is released during the suction stroke.

By turning the sac 31 inside out it is easy t assemble the discharge valve body over the discharge valve and to spring the internal flange 40a of the sac over the flange of the valve body 33. The cylindrical wall of the sac 31 is then folded back to its normal position and the barrel 30 slidden therein and engaged with the discharge valve body 33. The open end of the sac is then sprung over the locking shoulder on the barrel, and the piston 39 is inserted into-the barrel and the bead or flange of its rubber sleeve 42 sprung over its'locking shoulder on the cylinder. The telescopic members having been assembled together the apertured conical nut 59 is passed thereover and screwed on to the barrel.

The two part container 46 for housing the device may be so proportioned and arranged that the container parts may be screwed together sufficiently to seal off the nozzle 48 by closing the plug suction valve 41 and sealing the medial perforation- 41a therein as well as sealing off the inner end of the catheter 44.

The appliances can beas readily disassembled when desired.

Fig. 3 shows a modification in which the elastic sleeve 42 and its head 43 is anchored by anchoring slots to a diiferentially threaded ring 55 screwed externally to the tube 45 and internally to the piston 39. Such an arrangement allows of easydisconnection of the parts for cleaning or renewal.

Fig. 4 shows a modification in which the suction valve is, situated in the nozzle or telescopic member 23 and in which provision is made for the insertion of interchangeable single channel nozzles 56.

Fig. shows a modification in which the piston 60 has a screw union 6! with the tube 45.

According to the construction shown by Fig. 6, the cylinder II! has a closed end II in which the discharge, valve 12 is seated. I3 is the sac and 14 the non-return valve. I

Fig. 7 shows a construction adapted to be filled from a water-tap lfll by removal of a discharge nozzle and fitting a connector I00.

In all cases the pump filling means including the suction valve may be omitted where it is desired to rely only upon tap filling.

The syringe can be constructed almost entirely of a phenolic condensation product, or like substance, and rubber, so as to be of very light weight and readily cleaned, disinfected and dried.

Apparatus according to the present invention is well suited for manufacturing by moulding processes.

What I claim is:-

l. A syringe or the like of the kind hereinbefore referred to, comprising an inner rigid tubular member, an outer elastic sac or bag surrounding said rigid tubular member and completely enclosing one end thereof, the end of such sac being secured to such tubular member in a fluid tight manner and the said member being constructed so as to form between its external surface and the sac a fluid-storing space, the walls of the sac normally lying in close proximity to the external surface of the tubular member and being adapted to be expanded and elastically energized by fluid pressure, a fluid inlet from the interior of said tubular member to said storage space and a one-way valve controlling said inlet whereby to permit fluid to enter intosaid storage space and elastically energize the walls of said sac, an outlet from said storage space and a regulatable push discharge valve cooperating with said outlet, said valve being situated inside the sac and being operable by pressure on the sac so that the fluid can be automatically discharged from the storage space by the pressure exercised by the elastically energized walls of the sac.

2. A syringe or the like of the kind hereinbefore referred to, comprising an inner rigid tubular member, an outer elastic sac or bag fitted over said rigid tubular member so as to surround said member and completely enclose one end thereof, the side walls of such sac being secured at each end to such tubular member in a fluid tight manner and the said member being constructed so as to form between its external surface and the sac a fluid-storing space, the walls of the sac normally lying in close proximity to the external surface of the tubular member and being adapted to be expanded and elastically energized by fluid pressure, a fluid inlet from the interior of said tubular member to said storage space and a one way valve controlling said inlet whereby to permit fluid to enter into said storage space' and elastically energize the walls of said sac, an outlet from said storage space and a regulatable push discharge valve cooperating with said outlet, said valve being situated inside the sac and being operable by pressure on the sac so that the fluid can be automatically discharged from the storage space by the pressure exercised by the elastically energized walls of the sac, the end wall of the sac being adapted to be elastically energized when the discharge valve is operated and serving elastically to force the valve to close said outlet when the operating pressure is removed.

3 A syringe or the like of the kind hereinbefore referred to, comprising an inner rigid tubular member, an outer elastic sac or bag fitted over said rigid'tubular member so as to surround said member and completely enclose one end thereof, the end o'f'sucl'i sac being 'ec mental in ai 'fliiid tigh' membi being-constructed so to rent He tween its externalsurface and the sac a fluidstoring space, the walls of the-sac normally lying in close proximity to the external surface of the tubular member and being adapted to be expanded and elastically energized'by fluid pressure, a fluid inlet from the interior of said tubular member to said storage space and a one way valve controlling said inlet whereby to permit fluid to enter into said storage space and elastically energize the walls of said sac, an outlet from said storage space formed in that end wall of such tubular member which is adjacent the end wall of the sac and a regulatable push discharge valve cooperating with said outlet, said valve being formed integrally in one piece with the end wall of the sac and projecting inwardly from the inner face of said wall, said valve being operable by pressure on the end'wall of the sac so that the fluid can be automatically discharged from the storage space by the pressure exercised by the elastically energized walls of the sac.

4. A syringe or the like as claimed in claim 1,

in which the side walls of the sac are attached in.

elastic sac or bag fitted over said inner rigid tubular member so as to completely enclose one end thereof, the end of such sac or bag being secured to such tubular member in a fluid tight manner so as to form a contractible storage space between the walls of the sac or bag and the said member, the said walls of the bag normally lying in close proximity to the tubular member, a one-Way valve controlled inlet to said storage space for filling, a hollow stem extending axially along the cylinder and carried by said tubular member, a pump piston movable along said stem, and a regulatable push'dischargevalve situated inside the sac and having its seating at the outer end of said stem, at spindle connecting saidpush discharge valve to the end wall of the sac, said discharge valve being operable by pressure on the sac, so that the fluid is automatically discharged at a regulatable rate by reason of the elastic contraction of the said storage space.

'7. A syringe or the like of thekind hereinbefore referred to comprising an inner rigid cylinder or barrel, an outer elastic sac or bag fitted over said inner rigid tubular member so as to completely enclose oneend thereof, the end of such sac or bag being secured to such tubular member in a fluid tight manner so as to form a contractible storage space between the walls of the sac or bag and the said member, the said 8. A syringe or the like of the kind hereinbefore referred to comprising an inner rigid tubular member, a filling and discharging tube communicating with the interior of said member, an outer elastic sac or bag fitted over said inner rigid tubular member so as to completely enclose one end thereof, the end of such sac or bag being secured to such tubular member in a fluid tight manner so as to form a contractible storage space between the walls of the sac or bag and the said member, the said walls of the bag normally lying in close proximity to the tubular member, a one-way valve controlled inlet to said storage space for filling from the interior of the tubular member and expanding the Walls of the sac, and a discharge outlet from said storage space and a regulatable push discharge valve situated inside the sac and cooperating with said outlet, said discharge valve being operable by pressure on the sac, so as to permit the stored fluid to be automatically discharged at a regulatable rate by reason of the elastic contraction of the said storage space.

9. A syringe or the like of the kind hereinbefore referred to comprising an inner rigid tubular member serving as a pump cylinder, a filling and discharging tube, and a piston connected thereto and working in said cylinder, an outer elastic sac or bag fitted over said inner rigid tubular member so as to completelyenclose one end thereof, the end of such sac or bag being secured to such tubular member in a fluid tight manner so as to form a contractible store age space between the walls of the sac or bag and the said member, the said walls of the bag normally lying in close proximity to the tubular member, a one-way valve controlled inlet to said storage space for filling by causing relative movement between the piston and the cylinder, a valve adapted to be closed by the pressure exerted by the tube against the bottom of the vessel from which the fluid is being pumped into the expansible storage chamber and automatically opened during the suction stroke, and a discharge outlet from said storage space and a regulatable push discharge valve situated inside the sac and cooperating with said outlet, said discharge valve being operable by pressure on the sac, so as to permit the fluid to be automatically discharged at a regulatable rate by reason of the elastic contraction of the said storage space.

10. A syringe or the like of the kind hereinbefore referred to, comprising an inner rigid hollow cylinder or barrel having an end wall, an outer elastic sac or bag fitted over said inner rigid tubular member so that its end wall lies adjacent to said end wall of the rigid cylinder, the free end of such sac being secured to such cylinder in a fluid tight manner so as to form a contractible storage space between the walls of the sac and the said cylinder, the said walls of the sac normally lying in close proximity to the cylinder, a discharge opening in said end wall of the cylinder and a regulatable push discharge valve situated inside the sac and seated in said opening, said valve being operable by pressure on the sac so as to permit the fluid to be automatically discharged at a regulatable rate by reason of the elastic contraction of the said storage space.

l1 A syringe or the like of the kind hereinbefore referred to, comprising an inner rigid tubular member serving as a pump cylinder, a filling and discharging tube and a piston carried by said tube and arranged to work in said cylinder, an outer elastic sac or bag fitted over said inner rigid tubular member so as to completely enclose one end thereof, the end of such sac or bag being secured to such tubular member in a fluid tight manner so as to form a contractible storage space between the walls of the sac or bag and the said member, the said Walls of the bag normally lying in close proximity to the tubularmember, a valve past which fluid can be pumped into said storage space to fill the latter and expand the walls of the sac, a discharge outlet from said storage space and a regulatable push discharge valve situated inside the sac and cooperating with said outlet, said valve being operable by pressure on the sac, so that the fluid is automatically discharged at a regulatable rate by reason of the elastic contraction of the said storage space.

12. A syringe or the like of the kind herein: before referred to comprising an inner rigid cylinder or barrel, an outer elastic sac or bag fitted over said inner rigid tubular member so as to completely enclose one end thereof, the end of such sac or bag being secured to such tubular member in a fluid tight manner so as to form a contractible storage space between the walls of the sac or bag and the said member, the said walls of the bag normally lying in close proximity to the tubular member, a piston in said cylinder or barrel, a suction valve in said piston, a one way valve controlled inlet to said storage space, a discharge outlet from said storage space and a regulatable push discharge valve situated inside the sac and cooperating with said outlet. said valve being operable by pressure on the sac, so as to permit the fluid to be automatically discharged at a regulatable rate by reason of the elastic contraction of the said storage space.

13. A syringe or the like of the kind hereinbefore referred to comprising an inner rigid cylinder or barrel and an open ended piston working therein so as to form a pump, a filling tube serving also as a discharge tube, a suction valve in said tube, said valve opening on the suction stroke of said pump, an outer elastic sac or bag fitted over said inner rigid tubular member so as to of the sac or bag and the said member, the said walls of the bag normally lying in close proximity to the tubular member, a discharge outlet from said storage space and a regulatable push discharge valve situated inside the sac and cooperating with said outlet, said valve being integral with said sac, and being operable by pressure on the sac, so as to permit the fluid to be automatically discharged at a regulatable rate by reason of the elastic contraction of the said storage space.

14. A syringe or the like of the kind hereinbefore referred to comprising an inner rigid cylinder or barrel and an open ended piston working therein and so as to form a pump, a telescopic filling tube serving also as a discharge tube, a nozzle at the end of said tube, a valve in said nozzle, said valve opening on the suction stroke of said pump, an outer elastic sac or bag fitted over said inner rigid tubular member so as to completely enclose one end thereof, the end of such sac or bag being secured to such tubular member in a fluid tight manner so as to form a contractible storage space between the walls of the sac or bag and the said member, the said walls of the bag normally lying in close proximity to the tubular member, an outlet from said space and a regulatable push discharge valve situated inside the sac and cooperating with said outlet, said valve being integral with said sac and operable by pressure on the sac, so as to permit the fluid to be automatically discharged at a regulatable rate by reason of the elastic contraction of the said storage space.

15. A syringe or the like of the kind hereinbefore referred to comprising an inner rigid cyl-' inder or barrel, an open ended piston working therein, a filling tube serving also as a discharge tube, a removable nozzle at the end of said tube,

15 an outer elastic sac or bag fitted over said inner rigid tubular member so as to completely enclose one end thereof, the end of such sac or bag being secured to such tubular member in a fluid tight manner so as to form a contractible storage space between the walls of the sac or bag and the said member, the said walls of the bag normally lying in close proximity to the tubular member, a dis- 1 charge outlet from said space and a regulatable push discharge valve situated inside the sac and cooperating with said outlet, said valve being operable by pressure on the sac so as to permit the fluid to be automatically discharged at a regulatable rate by reason of the elastic contrac tion of the said storage space.

HANS HERBERT SCHULZ. 

